code: def UInt64ByteSize(field_number, uint64):
      return TagByteSize(field_number) + _VarUInt64ByteSizeNoTag(uint64)
  
imports: import struct
  from google.protobuf import descriptor
  from google.protobuf import message
label_desc: Use image node_id 9 for calling a global function with example usage: UInt64ByteSize(field_number, uint64) and returns: unknown